<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
        }
        .box {
            width: 400px;
            height: 400px;
            position: absolute;
            margin-top: -200px;
            margin-left: -200px;
            left: 50%;
            top: 50%;
            background: #03a9f4;
        }
        .box-item {
            width: 200px;
            height: 200px;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            background: #0037ff;
        }
        .box-inner-item {
            width: 100px;
            height: 100px;
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            margin: auto;
            background: #720026;
        }
    </style>
</head>
<body>
<div class="box">
    <div class="box-item">
        <div class="box-inner-item"></div>
    </div>
</div>
</body>
</html>
